US Stocks Rally on Trump's War Comments as Oil Volatility Whipsaws Markets

Monday's markets moved in sharp counterpoint to a single man's words. President Trump declared the war with Iran "very complete" and "very far ahead of schedule," and within hours the stock market reversed course from its morning slide. The S&P 500 closed up 0.83 percent, the Nasdaq 100 gained 1.38 percent, and the broader Morningstar US Market Index rose 0.85 percent. Growth stocks led the way, with large-cap growth climbing 1.65 percent while large-cap value actually fell 0.05 percent. But after the market closed, Trump appeared to walk back those same remarks, leaving investors uncertain which version of his assessment to believe.

The day had opened in turmoil. Over the weekend, production cuts rippled through major Middle Eastern energy producers—Kuwait, Iran, and the United Arab Emirates all reduced output—while strikes targeted oil storage facilities across the region. Bahrain Petroleum Company declared force majeure, becoming the second regional producer after Qatar to do so. The result was immediate: Brent crude jumped roughly 30 percent to nearly $120 per barrel in early trading. The Cboe Volatility Index spiked above 30 for the first time since April 2025's tariff crisis. Global markets convulsed. European stocks fell 0.83 percent in dollar terms. Asian markets dropped nearly 3.90 percent, with South Korea's KOSPI index triggering its second circuit breaker since the war began after lawmakers warned that surging energy costs threatened the country's semiconductor industry.

Then Trump spoke, and oil retreated. By midday, Brent crude had pared its gains to 8 percent, trading around $100 a barrel, while WTI crude was up 5 percent at $96. After Trump's comments about the war's completion, WTI fell further still, dropping to $88 per barrel. The Group of Seven had also signaled willingness to release strategic oil reserves if needed, adding downward pressure to prices that had seemed destined to climb higher.

The stakes are substantial. Qatar's energy minister told the Financial Times last week that continued disruption to Gulf exports could push oil to $150 a barrel within two to three weeks. Trump himself had posted on Truth Social that higher oil prices were a "very small price to pay" for destroying Iran's nuclear capabilities. Yet the market's reaction suggested investors were far less willing to accept that trade-off than the president appeared to be.

The real concern now centers on inflation. Bank of America analysts noted that history shows sharp, sustained crude spikes can trigger persistent inflationary cycles. Before Monday, oil prices had risen roughly $15 above prewar levels—manageable, they argued. But prices above $100 a barrel represent a different threshold. If those levels hold, inflation could accelerate, forcing central banks to reconsider their policy paths. Over the past week, traders have already begun shifting expectations away from rate cuts and toward likely hikes from the European Central Bank and Bank of England, with the Federal Reserve potentially delivering fewer cuts than previously anticipated. The 10-year Treasury yield ticked up 0.02 percentage points to 4.156 percent before settling back to 4.112 percent. Gold fell 0.15 percent to $5,150.

What remains unclear is whether Trump's initial comments represent a genuine shift in the conflict's trajectory or merely a tactical statement designed to calm markets. His subsequent contradiction suggests even he may not be certain. For investors, the question is whether to trust the morning's optimism or prepare for the volatility that has defined markets since the war began—a volatility that will likely persist as long as oil prices remain untethered to any clear resolution.